Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d961db0cb556a6…

MALICIOUS

PDF

81.7 KB Created: 2021-02-27 10:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a879190cc540eda5c2f1fb0d1de44485 SHA-1: 9a365c4e68954c595b8b98b175bac3becfcb6b99 SHA-256: c5d961db0cb556a60762449eb95ce4a86793f88dd8567f0d4f3bc7d7a0bca55d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/wix?keyword=software+manual+testing+resume+samples+pdf PDF link annotation
    • https://cdn.sqhk.co/rerunagakiz/jajeujf/eastside_hockey_manager_2020_rosters.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/NhibheE/word_search_books_for_adults_target.pdfIn PDF document text
    • http://forexgeeks.net/29876565698906ie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426071/normal_5fceaf3c65509.pdfIn PDF document text
    • http://uscreditreport.info/c_primer_plus_stephen_prata_downloadj2g39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_602d4de56128b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_6021a4ff063be.pdfIn PDF document text
    • http://qqkaxes.xyz/fadumowetajafukojax9chzk.pdfIn PDF document text
    • http://wssummer.space/9674455582523eif.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/ga9cISV/42743272277.pdfIn PDF document text
    • http://chambrely.xyz/how_to_check_f_distribution_table1nbz2.pdfIn PDF document text
    • http://lnstagram-helping.live/how_to_convert_manual_transmission_to_automatic_transmissionw6fz1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503874/normal_5ff3ba32f3d06.pdfIn PDF document text
    • http://amandeepsadyora.com/cross_platform_browser_plugin_developmentn53de.pdfIn PDF document text
    • http://bitejes.iblogger.org/facebook_canvas_template.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/bgdieRt/70011773910.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413838/normal_600893b892fbb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafonoxerinomif.epizy.com/zebolekarisolejinanedo.pdfIn PDF document text
    • http://puwolivorofe.rf.gd/kabiwinipotiguju.pdfIn PDF document text
    • http://xevupan.rf.gd/game_hungry_dragon_world_mod_apk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 5556 bytes
SHA-256: 56337b1109e66685a394904f054e4116e967cc9517460e1276b499fc33cb1c8f
font_01_sfnt_off000114ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EC 10624 bytes
SHA-256: 5821fbcacead277c8393081d8c28ba7720a63f491420d5abc48aedd2f2468e73

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